[Xen-users] Add in card GPU pass through causing built-in video artifacts

[David Erickson <halcyon1981@xxxxxxxxx>]

Hi all-
Yesterday I put together a machine that successfully passes the GPU
through to a Windows 7 x64 VM, however once the VM starts up, the
onboard video card showing the console for dom0 starts showing
scrambled video, predominantly a single random color wiping the
screen.  Everything in the VM seems fine, video is accelerated, etc.
Rebooting or stopping the VM has no effect on the on-board video, I
have to reset the box to fix it.  Here are the relevant specs:

Intel Xeon E3 1230 V2 (Ivy Bridge @ 3.3ghz)
Tyan SS512GM4NR C204 chipset - with an ASPEED onboard video chipset
ATI Radeon 7750 - passed through to Win 7 VM

Ubuntu 12.04 x64, kernel recompiled to include xen pcidev backend statically
xen-hypervisor-4.1-amd64         4.1.2-2ubuntu2.1
kernel line: module  /vmlinuz-3.2.19 placeholder
root=/dev/mapper/xen-root ro
xen-pciback.hide=(01:00.0)(01:00.1)(00:1d.0)

/etc/xen/win7.conf:

kernel="/usr/lib/xen-4.1/boot/hvmloader"
builder='hvm'
memory = 4096
vcpus=4
name = "win7"
vif = ['bridge=xenbr0']
disk = 
['phy:/dev/xen/win7,hda,w','file:/home/user/en_windows_7_professional_x64_dvd_X15-65805.iso,hdc:cdrom,r']
acpi = 1
device_model = 'qemu-dm'
boot="d"
gfx_passthru=1
pci=['01:00.0','01:00.1','00:1d.0']
sdl=0
serial='pty'
vnc=1
vnclisten="0.0.0.0"
vncpasswd=""
viridian=1
hpet=1
acpi=1
apic=1
pae=1

And VM is created simply using "sudo xm create /etc/xen/win7.conf"

Any help or suggestions greatly appreciated!

-David

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